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SSRN, the Social Science Research Network, hosts preprints and working papers in economics, law, finance, management, and other social science disciplines. It w

arXiv is the original preprint server, launched in 1991 and now hosting over 2.5 million papers in physics, mathematics, computer science, statistics, and relat

BASE is a search engine specifically for open access academic resources. It indexes over 400 million documents from more than 11,000 repositories and journals,

Library Genesis, commonly called LibGen, is one of the largest shadow libraries on the internet. It hosts millions of books and academic articles, including tex

Sci-Hub provides free access to millions of research papers that are otherwise locked behind publisher paywalls. Founded in 2011 by Alexandra Elbakyan, it works

OpenAlex is a free, open catalog of scholarly works, authors, institutions, and their connections. Launched in 2022 as a replacement for the discontinued Micros

Connected Papers takes a single paper you already know and builds a graph of related work. It doesn't rely on direct citations alone — it uses similarity measu

Semantic Scholar was built by the Allen Institute for AI to help researchers cut through information overload. Instead of matching keywords, it uses machine lea

Google Scholar applies Google's search technology to academic literature. It indexes journal articles, conference papers, theses, books, preprints, and patents

Healthchecks.io monitors cron jobs and scheduled tasks by waiting for a ping from your script. If the ping does not arrive on schedule, you get an alert. This c

CSS Battle presents a target image and challenges you to recreate it using the fewest characters of CSS possible. You write HTML and CSS in the browser and see

Grid Garden teaches CSS Grid by having you water carrots in a garden using grid properties. Each level introduces concepts like grid-template-columns, grid-colu

Flexbox Froggy teaches CSS Flexbox through a game where you help frogs reach lily pads by writing flexbox properties. Each level introduces a new property or va

Programiz provides beginner-friendly tutorials for Python, Java, C, C++, JavaScript, and other languages. Each lesson includes clear explanations and runnable c

Tutorialspoint offers short, structured tutorials on programming languages, web development, databases, operating systems, and computer science fundamentals. Ea

Packt publishes books and video courses on programming, cloud computing, data science, cybersecurity, and web development. Their catalog is large and frequently

Manning publishes practical books for software developers, covering programming languages, frameworks, algorithms, machine learning, and software design. Their

Pluralsight focuses on technology skills for working professionals: software development, cloud, security, data, and IT operations. Courses are organized into l

Skillshare hosts thousands of classes in illustration, design, photography, animation, writing, and creative business. Classes are typically project-based: you

Class Central is a search engine and review site for online courses. It catalogs offerings from Coursera, edX, FutureLearn, Udacity, and many university platfor

GTmetrix analyzes a web page and reports on performance metrics including load time, page size, and Core Web Vitals. It gives a letter grade, a list of recommen

Grafana connects to data sources like Prometheus, InfluxDB, Elasticsearch, PostgreSQL, and cloud monitoring services, then lets you build dashboards from the da

Sentry captures exceptions and performance data from applications in production. When something breaks, you get a stack trace, the context around the error, and

Category: Monitoring, DevOps, Website ToolsUptimeRobot checks your websites and services at regular intervals and alerts you when something goes down. It suppor

WebPageTest runs your website through a real browser on real devices from locations around the world and produces a detailed report on what loaded, when, and ho